QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

23 km N of Loíza, Puerto Rico

· 65 km deep · released about 630 lb of TNT

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10 km30 km60 km120 km N Loíza Municipio 23 kmCarolina Municipio 29 kmRío Grande Municipio 30 kmSan Juan Municipio 33 kmLuquillo Municipio 35 kmCanóvanas Municipio 35 kmCataño Municipio 37 kmTrujillo Alto Municipio 37 kmToa Baja Municipio 40 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 2.9 (md)
Depth
65 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Loíza Municipio, 23 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1511 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 630 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 24,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 17,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.5× the energy of this one
  4. This earthquake M 2.9 about 630 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 18.6430, -65.8658. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 23 km (15 mi) NNE of here earthquakes near Loíza Municipio
Carolina Municipio, PR 29 km (18 mi) NNE of here earthquakes near Carolina Municipio
Río Grande Municipio, PR 30 km (19 mi) NNW of here earthquakes near Río Grande Municipio
San Juan Municipio, PR 33 km (20 mi) NE of here earthquakes near San Juan Municipio
Luquillo Municipio, PR 35 km (22 mi) NNW of here earthquakes near Luquillo Municipio
Canóvanas Municipio, PR 35 km (22 mi) N of here earthquakes near Canóvanas Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

27 earthquakes have been recorded within 50 km since this one.

  1. 3.1 4 km NNW of Levittown, Puerto Rico
  2. 3.1 Puerto Rico region
  3. 3.2 60 km N of Loíza, Puerto Rico
  4. 2.4 3 km SSE of Pájaros, Puerto Rico
  5. 2.7 71 km NNE of San Juan, Puerto Rico
  6. 3.3 1 km ESE of Guaynabo, Puerto Rico
  7. 3.6 0 km W of Canovanas, Puerto Rico
  8. 3.4 28 km NNE of Vieques, Puerto Rico
  9. 3.5 54 km NNE of Luquillo, Puerto Rico
  10. 3.6 2 km ESE of Pájaros, Puerto Rico
  11. 2.9 47 km N of Suárez, Puerto Rico
  12. 3.0 2 km SW of Canovanas, Puerto Rico
  13. 2.7 0 km NW of Aguas Buenas, Puerto Rico
  14. 3.4 23 km NNE of Fajardo, Puerto Rico
  15. 2.8 12 km N of San Juan, Puerto Rico

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.